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Itens para a visualização no momento 11-20 of 22
Avaliação de um modulador a ar comprimido para GC×GC e sua aplicação para determinação de resíduos de pesticidas piretróides em uva
(Universidade Federal de Santa Maria, 2008-02-22)
In this study, a new modulator that is simple, robust and presents low operation costs was developed. This modulator uses compressed air to cool two small portions of the second chromatographic column of a GC×GC system. ...
5-trialometil-4,5-diidro-1h-1-(carbonilpiridil)pirazóis: síntese e atividade biológica frente ao Mycobacterium tuberculosis
(Universidade Federal de Santa Maria, 2008-08-06)
This work describes the synthesis of series of 5-hydroxy-3-[alkyl(aryl/heteroaryl)]-5-trifluoro[chloro]methyl-4,5-dihydro-1H-1(carbonylpyridyl)pyrazoles, obtained from the
reactions of 1,1,1-trihalo-4-[alkyl(aryl/hetero ...
Síntese de 3-arilselenofenos via reações de acoplamento de suzuki entre 3-iodoselenofenos e ácidos borônicos
(Universidade Federal de Santa Maria, 2008-01-25)
Não foi possível inserir o abstract.
Determinação voltamétrica de compostos de enxofre de baixo peso molecular em amostras de asfalto
(Universidade Federal de Santa Maria, 2008-07-25)
The content of sulfur compounds in asphalt is related to parameters of quality as reactivity, corrosiveness, toxicity and potential polluter, among others. In this work, a method for simultaneous determination of inorganic ...
β-Enaminonas, 5-hidróxi-4,5-diidropirazóis e 5-Hidróxi-4,5-diidroisoxazóis halometilsubstituídos: estudo molecular por difração de raios-x
(Universidade Federal de Santa Maria, 2008-08-08)
The molecular study by X-ray diffraction of β-aminovinyl ketones
[R3C(O)CH=C(R1)N(R4R5), onde R3 = CF3, CCl3, CHCl2; R1 = H, Me; R4 = H; R5 =
benzyl, Ph, 5-methylisoxazol-3-yl; R4, R5 = -(CH2)4-, -(CH2)2O(CH2)2-], methyl ...
Supramolecularidade de triazenos assimétricos dissubstituídos 4-(etoxicarbonilfenil)-2-(halofenil) e complexos de Ni(II), Cu(II) e Hg(II)
(Universidade Federal de Santa Maria, 2008-05-02)
Triazenes and/or triazenido ligands, strategically substituted by terminal aryl groups [-N=NN(H)-] or (-N3 --) chains and containing halogen in the ortho position and ester in the para position, were evaluated in ...
Determinação voltamétrica de 1,4-benzodiazepínicos e dietilpropiona como adulterantes em fitoterápicos para emagrecimento
(Universidade Federal de Santa Maria, 2008-09-12)
The adulteration of phytotherapic formulations has been a common practice in many countries, since there is not an specific legislation for the control of the manufacturing and commercialization of the so called natural ...
Determinação de resíduos de pesticidas em plantas de arroz empregando QuEChERS modificado e GC-ECD
(Universidade Federal de Santa Maria, 2008-12-19)
Rice culture is an activity that has currently been gaining more importance due to its use in human feeding, allowing enough food and acceptable quality to the population. There is a great concern regarding the intensive ...
Estudo de reações de N-alquilação de pirimidin-2-onas: síntese de novos análogos nucleosídicos modificados
(Universidade Federal de Santa Maria, 2008-01-15)
This work presents a study of the N-alkylation reactions of 4-
(trichloromethyl)pyrimidin-2(1H)-one(2), 5-bromo-4-methoxy-4-(trichloromethyl)-3,4-dihydropyrimidin-2-(1H)-one (7), 4-methoxy-4-(trichloromethyl)-3,4-dihydr ...
Síntese de 3-trifluoracetilpirróis N-substituídos
(Universidade Federal de Santa Maria, 2008-02-18)
This work presents a new, simple and versatile one-pot strategy for the synthesis of new N-substituted 3-trifluoroacetyl-pyrroles. These compounds were obtained by the reaction of 3-trifluoroacetyl-4,5-dihydrofuran with ...